Penn System 450 C450RCN-1 User manual

System 450 Series Reset Control Modules with
Real-Time Clock and Relay Output Installation
Guide
Application
Important: Use this System 450™ Series Reset
Control Modules with Real-Time Clock and Relay
Output only as an operating control. Where failure
or malfunction of the System 450 Series Control
Module could lead to personal injury or property
damage to the controlled equipment or other
property, additional precautions must be designed
into the control system. Incorporate and maintain
other devices, such as supervisory or alarm systems
or safety or limit controls, intended to warn of or
protect against failure or malfunction of the System
450 Series Control Module.
Important: Utiliser ce System 450 Series Reset
Control Modules with Real-Time Clock and
Relay Output uniquement en tant que dispositif
de régulation. Lorsqu'une défaillance ou un
dysfonctionnement du System 450 Series Control
Module risque de provoquer des blessures ou
d'endommager l'équipement contrôlé ou un
autre équipement, la conception du système de
contrôle doit intégrer des dispositifs de protection
supplémentaires. Veiller dans ce cas à intégrer de
façon permanente d'autres dispositifs, tels que
des systèmes de supervision ou d'alarme, ou des
dispositifs de sécurité ou de limitation, ayant une
fonction d'avertissement ou de protection en cas de
défaillance ou de dysfonctionnement du System 450
Series Control Module.
System 450 is a family of modular, digital electronic
controls that is easily assembled and set up to provide
reliable temperature, pressure, and humidity control for a
wide variety of HVACR and commercial/industrial process
applications.
The System 450 reset control modules allow you to
configure custom application-specific control systems
with reset control and/or real-time setback control for
temperature and humidity (only) control applications.
System 450 expansion modules allow you to control up to
10 outputs, which can be relay and analog outputs.
C450RxN-1 and C450RxN-3 Reset Control models are
Single-Pole, Double-Throw (SPDT) relay control modules
with temperature reset capability, real-time setback
capability, a Liquid Crystal Display (LCD), and a four-button
touch pad User Interface (UI) that allow you to set up
custom System 450 control systems.
The C450RBN-1 and C450RBN-3 model provide one SPDT
relay.
The C450RCN-1 and C450RCN-3 model provide two SPDT
relays.
Refer to the System 450 Series Modular Control Systems with
Reset Control Modules Technical Bulletin (LIT-12011842) for
more detailed information on designing, installing, setting
up, and troubleshooting System 450 Series components
and control systems.
Figure 1: System 450 Module dimensions, mm
Installation
Observe the following System 450 location guidelines:
• Ensure that the mounting surface can support the
module assembly, mounting hardware, and any (user-
supplied) panel or enclosure.
• Mount the modules upright and plugged together in
a horizontal row where possible (Figure 3). DIN rail
mounting is highly recommended.
• Mount modules on flat, even surfaces.
• Allow sufficient space for wires and connections.
• Mount the modules in locations free of corrosive vapors
and observe the ambient operating conditions in the
System 450 Series Reset Control Modules with Real-
Time Clock and Relay Output technical specifications.
• Do not mount the modules on surfaces that are prone
to vibration or in locations where radio frequency or
electromagnetic emissions may cause interference.
• Do not install the modules in airtight enclosures.
• Do not install heat-generating devices in an enclosure
with the modules that may cause the temperature to
exceed the ambient operating limit.
Part No. 24-7664-2888 Rev. E
2020-04-01
C450RBN, C450RCN

Mounting
Mount System 450 modules on 35 mm DIN rail
(recommended) or directly to an even wall surface. See:
•Mounting modules on DIN rail
•Direct-mounting modules to wall surfaces
Mounting modules on DIN rail
1. Provide a section of 35 mm DIN rail that is longer
than the module assembly width, and mount the
DIN rail horizontally in a suitable location using
appropriate mounting hardware/fasteners.
2. Clip the control module on the rail, position the upper
DIN rail clips on the top rail, and gently snap the
lower clips onto the rail.
3. Clip the remaining power and/or expansion modules
to the right of the control module on to the DIN
rail and plug the 6-pin module connectors together
(Figure 3).
Note: If your System 450 control system uses a
power module, the power module be plugged
into the right-hand side of the control module.
Direct-mounting modules to wall
surfaces
1. Plug the modules together, remove the module
covers, place the assembly against wall surface
horizontally in a suitable location, and mark the
mount hole locations on the surface (Figure 1).
2. Install appropriate screw fasteners, leaving screw
heads approximately one to two turns away from
flush to the surface.
3. Place the assembly over screw heads on the
mounting slots, and carefully tighten the mounting
screws.
Note: If you mount the modules on an uneven
surface, do not damage the housings when
tightening mounting screws. Use shims/
washers to mount module assembly evenly on
the surface.
Refer to the control sensor installation
instructions for information on locating and
mounting control sensors.
Wiring
See Figure 2 and Table 1 for electrical termination
locations and wiring information. See System 450 Series
Reset Control Modules with Real-Time Clock and Relay
Output technical specifications for electrical ratings.
WARNING
Risk of Electric Shock
Disconnect or isolate all power supplies before mak-
ing electrical connections. More than one disconnec-
tion or isolation may be required to completely de-en-
ergize equipment. Contact with components carrying
hazardous voltage can cause electric shock and may
result in severe personal injury or death.
AVERTISSEMENT
Risque de décharge électrique
Débrancher ou isoler toute alimentation avant de
réaliser un raccordement électrique. Plusieurs iso-
lations et débranchements sont peut-être néces-
saires pour -couper entièrement l'alimentation de
l'équipement. Tout contact avec des composants por-
teurs de tensions dangereuses risque d'entraîner une
décharge électrique et de provoquer des blessures
graves, voire mortelles.
Important:
• Use copper conductors only. Make all wiring in
accordance with local, national, and regional
regulations.
• Do not exceed the System 450 module electrical
ratings. Exceeding module electrical ratings can
result in permanent damage to the modules and
void any warranty.
• Run all low-voltage wiring and cables separate
from all high-voltage wiring. Shielded cable is
strongly recommended for input (sensor) and
analog output cables that are exposed to high
electromagnetic or radio frequency noise.
• Electrostatic discharge (ESD) can damage System
450 modules. Use proper ESD precautions during
installation and servicing to avoid damaging
System 450 modules.
• Do not connect 24 VAC supply power to the
System 450 modules before finishing wiring and
checking all wiring connections. Short circuits or
improperly connected wires can result in damage
to the modules and void any warranty.
• A System 450 control module and module
assembly can be connected to an internal power
source (a System 450 power module) or an
external power source (24 V power connected
to the 24V and COM terminals on the control
module), but must not be connected to both
power sources simultaneously. Connecting a
control module to both internal and external
power sources can damage the modules and void
any warranty.
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide2

• When connecting System 450 compatible sensors
with shielded cable to a System 450 control
module, connect the cable shield drain lead to one
of the C (common) terminals on the input sensor
terminal block. Do not connect the shield at any
other point along the cable. Isolate and insulate
the shield drain at the sensor end of the cable.
Connecting a cable shield at more than one point
can enable transient currents to flow through
the sensor cable shield, which can cause erratic
control operation.
See Figure 5 for the active/passive sensor jumper settings.
See System 450 menu flow example.
Figure 2: C450RxN-1 and C450RxN-3 wiring terminals
Callout Description
1 Supply power and input sensor terminals: low voltage (less than 30V) Labels: 5V, 24V, Sn-1, Sn-2, Sn-3
Note: Common terminals (C) are internally connected.
2 6-pin module connector
3 Second output relay and terminal block. Labels: LNC2, LN02 and LC2
Note: Not available in all models.
4 Internal SPDT relay. This is normally in the closed or off position and dry-contact, line-voltage relay output terminals. For more information on
electrical ratings, see System 450 Series Reset Control Modules with Real-Time Clock and Relay Output technical specifications. Labels: LNC1,
LN01, LC1
Note: The relay output terminals connect to an internal SPDT relay and do not supply any power to the application.
5 Active or passive sensor jumper positions Labels: Sn-1, Sn-2, Sn-3
Note: Jumpers are present only in Version 1.
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide 3

Figure 3: System 450 Reset Control System Example for a single boiler with a primary on/off boiler loop pump,
variable speed secondary loop pump, and a heated water modulating supply valve.
Note: In 120VAC applications, L1 must be the hot wire and L2 must be the neutral or common wire.
Callout Description>
1 A99 Temperature Sensor: Boiler supply water sensor, Sn-2, in Setup UI
2 Valve output temperature sensor Sn-3 in Setup UI.
3 A99 Temperature Sensor: Master Sensor for outdoor air, Sn-1, in Setup UI.
4 Active or passive sensor jumpers. All jumpers are set to passive by default. Note: Jumpers are only present in version 1.
5 Boiler on or off control circuit (24 to 240 VAC)
6 Boiler loop pump control circuit (24 to 240 VAC)
7 Secondary loop pump speed (0 to 10 VDC)
8 Mixing valve with 120F° setpoint (0 to 10 VDC)
9 Mixing valve with 120F° setpoint (0 to 10 VDC)
10 Relay Output 1
11 C450RCN-1 Reset Control Module
12 Relay Output 2
13 C450YNN-1 Power Module
14 Analog Output 3
15 C450SQN-1 Expansion Module
16 Analog Output 4
Table 1: System 450 terminal wiring information
Label Terminal function Wire sizes
24V Accepts 24 VAC supply power, when a C450YNN power module is not connected, and provides power
terminal for 24 VAC (humidity) sensors.
5V Provides 5 VDC power for active sensors.
Sn-1, Sn-2, Sn-3 Accepts passive or active (0-5 VDC) input signals from sensors.
In System 450 reset control systems, Sn-1 is the Master sensor (typically an outdoor air temperature sensor)
and Sn-2 is the controlled loop sensor (a temperature or humidity sensor).
Note: Jumpers are only present in Version 1.
You must position the Active/Passive Sensor Jumper (Figure 4 and Figure 5) correctly for each sensor in
your control system before operating the system. See Setting active/passive sensor jumpers for more
information.
C (Three Terminals) Provide low-voltage common connections for 24 VAC power and passive or active sensors connected to the
5V, Sn1, Sn2, and Sn3 terminals.
The three C terminals are connected internally and can be connected to ground in the field.
0.08 mm2 to 1.5 mm2
28 AWG to 16 AWG
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide4

Table 1: System 450 terminal wiring information
Label Terminal function Wire sizes
LNC1, LNC2 1Connects equipment control circuit to the normally closed contact on the SPDT1 relay.
LNO1, LNO2 Connects equipment control circuit to the normally open contact on the SPDT1 relay.
LC1, LC2 Connects line (power) to common on the SPDT1 relay.
0.08 mm2 to 2.5 mm2
28 AWG to 14 AWG
1 See Internal SPDT Relay insert in Figure 2 for more System 450 relay contact and terminal information. See System 450 Series Reset
Control Modules with Real-Time Clock and Relay Output technical specifications for SPDT relay electrical ratings.
Figure 4: System 450 Reset Control Module output
relay LEDs, LCD, and four-button touch pad UI
Table 2: System 450 Control Module Output Analog
LEDs, LCD, four-button touchpad UI
Callout Feature Description
1 Status or setup
value
Displays the current input status, output status, or
setup parameter value for the displayed input sensor
or output. Press Down or Up to select a different
parameter value when the value is flashing. Here,
100 = 100%.
2 LED Green LEDs on Control Modules and Expansion
Modules with relays (only) indicate if the associated
Relay Output is On or Off.
3 Output (or
Sensor) number
Displays a numerical value that identifies the output
or sensor associated with the status or setup
value shown on the screen. Output numbers are
automatically determined by the outputs' physical
positions (left to right) in the module assembly. Here,
4 = Output 4.
4 Control ramp
icon
Displays whether an analog output increases
or decreases as the sensor input increases, and
whether the output signal strength is at minimum or
maximum when the sensed property is at Setpoint.
The control ramp icon displayed is determined by the
output's SP, EP, Pb, OSET, OSP, and OEP setup values.
5 Next button In the Main screens, press Next to scroll through the
system status screens. In a setup screen, press Next
to save the flashing setup value and go to the next
setup screen.
6 Up and Down
buttons
Press Up or Down to select a different value for any
flashing value in the setup value field. In the Main
sensor status screens, press and hold both Up and
Down for 5 seconds to access the Setup Start screens.
7 Menu button Press M to move through the sensor and output
setup start screens. When moving through the status
or setup screens, press M to return to the status start
screen or setup start screen.
Table 2: System 450 Control Module Output Analog
LEDs, LCD, four-button touchpad UI
Callout Feature Description
8 Status or setup
identifier
Displays the unit of measurement, output, sensor
number, or setup parameter for the displayed
status or setup value. Here, the setup identifier OSP
represents % output signal strength at setpoint.
9 LCD Backlit LCD screen. The LCD brightness is adjustable.
During normal operation, the LCD displays the Main
screens.
Setup and adjustments
A System 450 reset control system consists of one reset
control module, one to three input sensors, and one to
ten outputs that provide any combination of (On/Off)
relay control or (0–10 VDC or 4–20 mA) analog control.
Figure 3 shows a reset control system for two boilers, a
boiler water circulation pump, and an outside air damper.
Setting up a module assembly
1. Determine the controlled conditions, sensor types,
and value ranges required for your control system,
and select the appropriate System 450 sensors.
2. Determine the number and type (relay or analog)
of outputs required to control your application, and
select the appropriate System 450 control module
and expansion modules.
3. Assemble the control and expansion modules,
starting with the control module on the left.
Note: If you use a C450YNN-1 power module, it
must be plugged into the control module. Plug
in any expansion modules (for your control
system) to the right of the power module.
4. Apply supply power to the module assembly.
You can now set up your control system in the System 450
reset control module UI.
Note: After you power on your module assembly,
you can set up your control system in the control
module UI before wiring the sensors or outputs to
your assembly.
Setting active/passive sensor jumpers
Before putting your System 450 reset control system into
operation, you must set up each sensor in your system
as either passive or active by positioning the jumper on
the terminal pins on the terminal block located below the
sensor terminal block. See Figure 3.
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide 5

Temperature sensors are passive (2-wire) sensors and the
corresponding jumpers must be positioned across both
pins. Humidity transducers are active (3-wire) sensors and
corresponding jumpers must be positioned on one pin (or
removed completely).
Figure 5 shows the jumper positions for the System 450
Reset Control example shown in Figure 3.
Figure 5: Active/Passive sensor jumper positions for
System 450
Note: Jumpers are only present in Version 1.
Setting up a control system in the UI
System 450 control modules have a backlit LCD and a
four-button touch pad UI (Figure 4) that enable you to set
up your control system.
1. Build your control system module assembly and
connect it to power. See Setting up a module
assembly.
Note: Every time a module assembly is
powered ON, the control module polls all of
the modules to identify output type (relay
or analog) and assigns a sequential output
number (1 to 9 [0 = 10]) to each output starting
with the control module output on the left. The
output numbers identify each output’s setup
screens in the UI. (See Figure 4.)
2. Access the System 450 setup screens in the UI. See
Accessing the System 450 Setup screens.
3. Set up the control system sensors (inputs) in the UI.
See Setting up System 450 Sensors.
4. Set up the control system outputs in the UI. See
Setting up System 450 Outputs.
5. Set up the clock and occupied/unoccupied schedule
in the UI for systems that use setback. See Setting up
time and day of week and Setting up an occupied/
unoccupied schedule.
Important:
- When power is disconnected, the time
clock keeps time for 12 hours before
resetting to default; the remaining setup
values entered into the UI remain in non-
volatile memory indefinitely.
- Do not change the module positions
after a System 450 control system is set
up in the UI. System 450 control logic is
set up in the UI according to the Sensor
Types, the output types, and the output
numbers. Changing modules or module
positions in a module assembly that is
already set up in the UI, can change the
output numbers, output types, and the
setup values of the assembly outputs,
which requires setting up the outputs
again.
See Figure 4 for an explanation of the System 450 display
screen and the 4-button touch pad features and functions.
See Table 3 for Reset Control Sensor Types and associated
sensors. See Setting up System 450 Sensors through
Relay Output and Analog Output that reference the
Reset function for System 450 UI setup information and
procedures.
Viewing the Main and System Status
screens
After you install, wire, power on, and set up your control
system in the UI, the Main screens appear on the LCD.
During normal operation, the Main screens automatically
scroll through the current status of each sensor in your
control system, the time and day, and the current Reset
Setpoint value.
The System Status screens display the current status of
each output in your control system and the runtime hours
for each Output Relay. In the Main screen, press Next
repeatedly to scroll through and view all of the Main and
System Status screens in your control system.
During normal operation, the Reset Control Main screens
automatically scroll through the current temperature or
humidity sensed at each sensor, the current time and day,
and the current calculated Reset Setpoint (RSP) value. See
the Main Screens row in the setup screens flow chart in
System 450 menu flow example.
Note:
• You must set up time and day of week for control
applications that use the setback feature, but you
can also set up time and day on control systems
that do not use the setback feature. If the time
and day have not been set up, the Time/Day
Status screen displays – –:– –, MON, and AM.
• Main screens are view-only; selections cannot be
made in Main screens.
During normal operation while the LCD is auto-scrolling
through the Main screens, press Next repeatedly to
scroll through and view the available System Status
screens. Press and hold Up and Down simultaneously
for 5 seconds to access the Setup Start screens and the
System 450 system setup screens.
In the following figure, the screen examples show Sensor
1 sensing 27°F outdoor air at the Master sensor, Sensor
2 sensing 151°F at the boiler water supply outlet, the
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide6

current time and day is 11:32 A.M. on Tuesday, and the
current calculated Reset Setpoint is 153°F.
Figure 6: Main screens
The System Status screens include all of the Main
screens, plus additional status screens for all the outputs
in your control system, including the following:
• Relay Output Status screens, which display output
number and relay status (On/Off).
• Analog Output Status screens, which display output
number, the current analog signal strength (as a % of
the total signal strength), and the control ramp icon.
• Runtime Hours Status screens, which display the
runtime (ON) hours for the Relay Outputs in your
control system.
See the System Status Screens row in the setup screens
flow chart in System 450 menu flow example.
Note:
• System Status screens (except Runtime Hours
Status screens) are view-only; selections cannot
be made in Status screens.
• When a Runtime Hours Status screen is displayed,
you can press and hold Down for 5 seconds to
clear the displayed runtime hours and reset the
Relay Output’s total runtime hours to 0.
Press Next repeatedly to scroll through and view the
System Status screens for your control system.
In the following figure, the screen examples show Relay
Output 1 is On; Analog Output 3 signal strength is 64
(%) and the control ramp icon indicates that the Analog
Output is set up with SP<EP and OSP<OEP; and Relay
Output 2 has 17 hours of total runtime (relay ON).
Figure 7: System Status screens
Accessing the System 450 Setup
screens
1. Apply power to your module assembly. After a
startup check, the (available) Main screens appear
and automatically scroll on the LCD.
Note: The only Main screen displayed, prior
to setting up your control system in the UI, is
the default time and day status screen, which
displays ––:––, MON, and AM.
2. In any of the Main screens, press and hold Up and
Down simultaneously for 5 seconds to go to the
Sensor Setup Start screen and access the rest of the
System 450 setup screens.
Note: The Sensor Setup Start screen is the first
screen displayed when you access the System
450 setup screens. From the Sensor Setup Start
screen, you can navigate to all of the remaining
setup screens for your control system.
3. Press M repeatedly to scroll through all of the Setup
Start screens. (See System 450 menu flow example.)
Note: All Setup Start screens are view-only;
selections cannot be made in Setup Start
screens. In any Setup Start screen, you can
return to the Main screens by pressing Up and
Down simultaneously. Also, the UI returns to
the Main screens after 2 minutes of inactivity in
any screen in the UI.
4. Press Next in any Setup Start screen to go to the
setup screens. (See System 450 menu flow example.)
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide 7

Setting up System 450 Sensors
You must set up the sensors (inputs) for your control system before you can set up any of the outputs. See Accessing
the System 450 Setup screens. The following table provides information about System 450 compatible sensors for Reset
Control Modules. System 450 menu flow example provides a System 450 UI screen flowchart example.
Table 3: System 450 Reset Control sensor types, setup values, and product codes
Sensor
type
Unit of
measuremen
t value
Range of
usable
values
Resolution
increment
s value
Minimum
differential
or
proportiona
l band
Effective
sensing
range
Range of
usable Pb/
dIFF and
SbK values
for RSP
Range of
usable
OSET
values for
RSP
Sensor
product
type
number
°F °F -40 to 250 1 1 -46 to 255 -30 to 30 -30 to 30 A99B-xxx
°C °C -40 to 121 0.5 0.5 -43 to 124 -17 to 17 -17 to 17 A99B-xxx
rH % Humidity 10 to 95 1 2 1 to 100 -20 to 20 -30 to 30 HE-67Sx-x
1. In the Sensor Setup Start screen, press Next to go
to the first Sensor Type Selection screen (Sn-1) and
begin setting up the sensors in your control system.
Press M (repeatedly) to scroll through the remaining
Setup Start screens.
The Sensor Setup Start screen is the first
screen displayed when you access the System
450 setup screens. From the Sensor Setup Start
screen you can navigate to all of the remaining
Setup Start screens in your control system. See
System 450 menu flow example.
The following figure shows the Sensor Setup
Start screen with flashing dashes.
Figure 8: Sensor Setup Start screen
Note: You must set up the sensors for your
control system, including the reset setpoint
sensor (rES) (if required for your application)
before you can set up the control system
outputs. All Setup Start screens are view-
only; selections cannot be made in Setup Start
screens.
2. In the Sn-1 Sensor Type Selection screen, press
Up or Down to select a Sensor Type (°F, °C, or --).
Press Next to save your selection and go to the Sn-2
Sensor Type Selection screen.
The following figure shows Sn-1 set to Sensor
Type °F.
Figure 9: Sn-1 Sensor Type Selection screen
The Sensor Type you select for an input sensor
automatically determines the setup parameters
and values for each output that is set up to ref-
erence that sensor. See Table 3 for information
about System 450 sensors/transducers, sensor
types, setup values, and product code numbers.
Note:
- System 450 Reset Control Modules are
designed for use with temperature (°C or
°F) and humidity (rH) Sensors Types only.
Pressure Sensor Types are not available
in the reset control module UI. You also
can select no Sensor Type (- -) when your
control systems uses less than three
sensors.
- In System 450 reset control systems,
Sensor 1 (Sn-1) is the Master sensor and
must always be a temperature sensor.
Sn-2 must be the control loop sensor.
The Sn-1 Master sensor is typically (but
not always) an outdoor air temperature
sensor. Sensor 2 (Sn-2) and Sensor 3
(Sn-3) can be temperature or humidity,
depending on your application. The
Reset Setpoint sensor (rES) cannot be set
up for your control system until both the
Sn-1 and Sn-2 are set up in the UI.
- For an output to operate properly,
the selected Sensor Type must match
the sensor model wired to the control
module, and the correct sensors must
be wired to the correct control module
input terminals.
3. In the Sn-2 Sensor Type Selection screen, press Up
or Down to select the desired Sensor Type (°F, °C, rH,
or --). Press Next to save your selection and go to the
Sn-3 Sensor Type Selection screen.
The following figure shows Sn-2 set to °F.
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide8

Figure 10: Sn-2 Sensor Type Selection screen
Note: If your control system does not use
three sensors, simply press Next while the two
dashes are flashing in a Sensor Type Selection
screen to save no Sensor Type and go to the
next screen.
4. In the Sn-3 Sensor Type Selection screen, press Up
or Down to select the desired Sensor Type (°F, °C, rH,
or --). Press Next to save your selection and go to the
Temperature Offset Setup screen for Sn-1.
The following figure shows Sn-3 set to rH.
Figure 11: Sn-3 Sensor Type Selection screen
5. Press Up or Down to select a temperature offset
value. Press Next and either:
- go to the next Temperature Offset Selection
screen (if there are additional temperature
sensors in your control system) and repeat
this step for each temperature sensor.
- return to the Sensor Setup Start screen.
The following figure shows 0 as the selected
temperature display offset value for Sensor 2.
Figure 12: Temperature Display Offset Selection
screen
Select a temperature offset for each tempera-
ture (only) sensor in your control system. The
selected offset value is added to the sensed
temperature value to calculate the displayed
temperature value (sensed °F + OFFS = dis-
played °F). The Temperature Display Offset
value is typically 0 or a very low value.
Sensor Type °F enables an offset of +/- 5°F in 1
degree increments. Sensor Type °C enables an
offset of +/- 2.5°C in 0.5 degree increments.
6. Press M to scroll through the remaining Setup Start
screens and continue setting up your control system,
or press Up and Down simultaneously to return to
the System 450 Main screens. The hardwire sensors
are setup in the UI.
Figure 13: Sensor Setup Start screen
Setting up the System 450 Reset
Setpoint
The System 450 Reset Control Modules feature
temperature and humidity setpoint reset capability based
on a Master temperature sensor (Sn-1) and a control loop
sensor (Sn-2).
You easily can set up a custom calculated (floating)
Reset Setpoint (RSP) that can be referenced by any of
the outputs in your control system. All control system
outputs that are set up to reference the Reset Setpoint
sensor (rES) use the same RSP setup parameters and RSP
to control output. During normal operation the current
RSP is displayed in one of the Main screens.
The following figure and table illustrate the relationships
between the setup parameters that define the calculated
RSP.
Figure 14: Example Reset Setpoint Applications for
Boiler Water Supply and Chiller Water Supply showing
the relationships between the Reset Setpoint Setup
parameters
Table 4: Example Reset Setpoint Applications for Boiler
Water Supply and Chiller Water Supply details
Item Description
MNSP
Minimum Reset Setpoint
(110 [°F] BWS Temperature)
(45 [°F] CWS Temperature)
MXSP
Maximum Reset Setpoint
(180 [°F] BWS Temperature)
(60 [°F] CWS Temperature)
RSTR
Reset Range Start Temperature
(50 [°F] Outdoor Air for BWS)
(95 [°F] Outdoor Air for CWS)
RENd
Reset Range End Temperature
(0 [°F] Outdoor Air for BWS)
(75 [°F] Outdoor Air for CWS)
RSP
Calculated (Floating) Reset Setpoint
From 0 to 50°F outdoor air, the Boiler Water Supply (BWS) setpoint is reset
between 180 and 110°F. Above 50°F outdoor air, the BWS setpoint is 110°F.
Below 0°F outdoor air, the BWS is 180°F.
From 75 to 95°F outdoor air, the Chiller Water Supply (CWS) setpoint is
reset between 60 and 45°F. Above 95°F outdoor air, the CWS setpoint is
45°F. Below 75°F outdoor air, the CWS is 60°F.
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide 9

Note: You must set up Sn-1 and Sn-2 before you
can set up a RSP for your reset control system. Sn-1
is always the Master temperature sensor; typically
an outdoor air temperature sensor. Sn-2 is always
the control loop sensor; typically a boiler or chiller
water supply loop sensor. But Sn-2 can also be a
zone temperature or humidity sensor depending on
your application, and the RSP can be a temperature
or humidity value depending on the Sn-2 Sensor
Type you select in the Sensor Setup screens.
When you select the rES sensor in an output’s
Sensor Selection screen, the output references the
RSP, and System 450 displays the remaining output
setup screens for setting up reset control based on
a calculated (floating) setpoint (RSP) or proportional
band (RSP + Pb).
Note: If you select Sn-1, Sn-2 or Sn-3 in the Sensor
Selection screen, the output references a standard
temperature or humidity sensor; and System 450
displays the remaining output setup screens for
setting up standard control based on the fixed
setpoint or proportional band (SP and EP) you select
for the output.
You can also select a Shutdown High Temperature
(SdHI) and/or Shutdown Low Temperature (SdLO)
to shut down or limit the outputs that reference the
rES sensor.
You can also enable Load Balancing (bAL) to
balance the runtimes (relay ON times) of all relay
outputs (only) that reference the rES sensor.
1. In the Reset Setpoint Setup Start screen, press
Next to go to the next screen and begin setting
up the Reset Setpoint. You can set up a floating
Reset Setpoint Sensor Type (rES) that can be
referenced by the outputs in your System 450 reset
control system. You can also select high and low
temperature shutdown values (SdHI and SdLO)
and an unoccupied Setback (SbK) for all Outputs
with reset; and enable Load Balancing for relay
(only) outputs with reset. See the Reset Setpoint
Setup Screens row in the setup screens flow chart in
System 450 menu flow example.
Note: Sn-1 and Sn-2 must be set up in the UI
before the Reset Setpoint Setup Start screen
is available. All Setup Start screens are view-
only; selections cannot be made in Setup Start
screens.
The following figure shows the Reset Setpoint
Setup Start screen. The remaining figures
in this procedure show the setup parameter
values selected for the RSP, high and low
temperature shutdown, unoccupied setback,
and load balancing that are used by the outputs
setup to reference the rES sensor (Output 2
and Output 4) in the control system example in
Figure 3.
Figure 15: Reset Setpoint Setup Start screen
2. In the Minimum Reset Setpoint Selection screen,
press Up or Down to select the Minimum Reset
Setpoint value for the controlled condition (sensed
at Sn-2). The selected Minimum Reset Setpoint
(MNSP) value establishes the lowest (temperature or
humidity sensed at Sn-2) setpoint value that outputs
with reset control can reference. The MNSP value
and the Maximum Reset Setpoint (MXSP) value
establish the total (temperature or humidity) range
for the floating RSP value. See Figure 14. Press Next
to save your selection and go to the next screen.
The following figure shows a Minimum Reset
Setpoint value of 110 (°F).
Figure 16: Minimum Reset Setpoint Selection screen
3. In the Maximum Reset Setpoint Selection screen,
press Up or Down to select the Maximum Reset
Setpoint value for the controlled condition (sensed
at Sn-2). The selected Maximum Reset Setpoint
(MXSP) value establishes the highest (temperature
or humidity sensed at Sn-2) setpoint that outputs
with reset control can reference. The MXSP value
and the MNSP value establish the total (temperature
or humidity) range for the floating RSP value. See
Figure 14. Press Next to save your selection and go
to the next screen.
The following figure shows a Maximum Reset
Setpoint value of 180 (°F).
Figure 17: Maximum Reset Setpoint Selection screen
4. In the Reset Range Start Temperature Selection
screen, press Up or Down to select the Reset Start
Temperature value (sensed at the Master sensor
Sn-1). The Reset Start Temperature (RSTR) value
and the Reset End Temperature (RENd) value
establish the temperature range over which the RSP
is calculated. RSTR and RENd are sensed at the Sn-1
Master sensor (typically outdoor air temperature).
RSTR defines the high limit of temperature range
and corresponds with MNSP. As the outdoor air
temperature decreases below the RSTR, the RSP is
driven from the MNSP towards MXSP. See Figure
14.Press Next to save your selection and go to the
next screen.
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide10

Note: The relationship between RSTR and RENd
(RSTR > RENd or RSTR < RENd) determines
whether an increase in temperature sensed
at Sn-1 increases or decreases the RSP. The
examples shown in Figure 14 (RSTR > RENd)
show RSP increases when the temperature
increases at the Sn-1 Master sensor.
The following figure shows a Reset Range Start
Temperature value of 50 (°F) selected.
Figure 18: Reset Range Start Temperature Selection
screen
5. In the Reset Range End Temperature Selection
screen, press Up or Down to select the Reset End
Temperature value (sensed at the Master sensor
Sn-1). The Reset End Temperature (RENd) value and
the RSTR value establish the temperature range
over which the RSP is calculated. RSTR and RENd are
sensed at the Sn-1 Master sensor (typically outdoor
air temperature). RENd defines the low limit of
the temperature range and corresponds with the
MXSP. As the outdoor air temperature increases
above the RENd, the RSP is driven from the MXSP
towards MNSP. See Figure 14. Press Next to save
your selection and go to the next screen.
The following figure shows a Reset Range End
Temperature value of 0 (°F) selected.
Figure 19: Reset Range End Temperature Selection screen
6. In the Shutdown High Temperature Selection
screen, press Up or Down to select the Shutdown
High Temperature value (sensed at the Master
sensor Sn-1). Shutdown High Temperature (SdHI)
value establishes a high temperature limit (sensed
at the Master sensor) at which relay outputs go to
OFF and analog outputs go to the Output at Setpoint
(OSP) value for all outputs in your control system
that reference the Reset Setpoint sensor (rES). SdHI
is typically used for heating systems to shutdown
(relay) or limit (analog) output at high outdoor air
temperatures. Press Next to save your selection and
go to the next screen.
The following figure shows an Shutdown High
Temperature value of 65 (°F) selected.
Figure 20: Shutdown High Temperature Selection screen
7. In the Shutdown Low Temperature Selection
screen, press Up or Down to select the Shutdown
Low Temperature value (sensed at the Master sensor
Sn-1). Shutdown Low Temperature (SdLO) value
establishes a low temperature limit (sensed at the
Master sensor) at which the relay outputs go to OFF
and the analog outputs go to the Output at Setpoint
(OSP) value for all outputs in your control system
that references the Reset Setpoint sensor (rES). SdLO
is typically used for cooling systems to shutdown
(relay) or limit (analog) output at low outdoor air
temperatures. Press Next to save your selection and
go to the next screen.
The following figure shows no Shutdown Low
Temperature value selected.
Figure 21: Shutdown Low Temperature Selection screen
8. In the Unoccupied Setback Selection screen,
press Up or Down to select the Setback value
for the controlled condition (temperature or
humidity) during scheduled Unoccupied times. The
selected Setback (SbK) value determines a (floating)
unoccupied setback value (RSP + SbK) for all of the
relay and analog outputs that reference the rES
sensor. The unoccupied Setback value (RSP + SbK) is
referenced during all scheduled unoccupied times.
Press Next to save your selection and go to the next
screen.
Note: To use the Setback feature in your
control system, you must also set up the (real)
time and day of week, and a weekly occupied/
unoccupied schedule. See Setting up time
and day of week and Setting up an occupied/
unoccupied schedule for more information and
setup procedures.
Note: Setback set point temperature does
not exceed MXSP or go lower than MNSP. In
reset, MNSP and MXSP are limits to set point
excursion.
The following figure shows a Setback value of
-10 (°F) selected.
Figure 22: Unoccupied Setback Selection screen
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide 11

9. In the Load Balancing Selection screen, press Up
or Down to enable (ON) or disable (OFF) the Load
Balancing feature for your Reset Control system.
When the System 450 Load Balancing feature is
enabled (ON), the control system uses the relay ON
time of each Relay Output that references the RSP
sensor and balances the total ON times of these
Relay Outputs by cycling ON the Relay Output with
the lowest total ON-time first, and the second lowest
ON-time second, and so on. Press Next to save
your selection and return to the Reset Setpoint Start
screen.
Note: The Load Balancing feature is not
available for analog outputs.
The following figure shows Load Balancing
feature is enabled (ON).
Figure 23: Load Balancing Selection screen
10. In the Reset Setpoint Setup Start screen, press M to
scroll through the remaining Setup Start screens and
continue setting up your control system, or press Up
and Down simultaneously to return to the System
450 Main screens. The Reset Setpoint is now set up in
the UI.
Figure 24: Reset Setpoint Setup Start screen
Setting up System 450 Outputs
After you build and connect power to your control system
module assembly, the output numbers and output types
for your control system are automatically assigned in the
UI.
Note: You must set up the system sensors for your
control system before you can set up the outputs.
1. Access the System 450 setup screens. (See Accessing
the System 450 Setup screens.) The Sensor Setup
Start screen appears.
2. At the Sensor Setup Start screen, press M
repeatedly to scroll through and select the desired
Output Setup Start screen. The Output Setup Start
screen indicates the output number and the output
type for the selected output.
To set up Standard System 450 outputs without Reset
Setpoint, see the following sections:
•Setting up a Standard Relay Output
•Setting up a standard Analog Output
To set up System 450 outputs with Reset Setpoint, see the
following sections:
•Setting up a Relay Output with Reset Setpoint
•Setting up an Analog Output with Reset Setpoint
Setting up a Standard Relay Output
A standard relay output provides On/Off control for your
application based on a fixed setpoint sensor (Sn-1, Sn-2,
or Sn-3).
1. In the Relay Output Setup Start screen, press
Next to go to the Sensor Selection screen. The
output number and output type (relay or analog) are
automatically assigned when you connect power to
the module assembly. See the Standard Relay Output
Setup Screens row in the setup screens flow chart in
System 450 menu flow example.
Note: All Setup Start screens are view-only;
selections cannot be made in Setup Start
screens.
The following figure shows the Relay Output
Setup Start screen for Output 4. The remaining
screens in this table show the parameter
values selected for controlling the boiler water
circulation pump connected to Relay Output 4
in Figure 3.
Figure 25: Relay Output Setup Start screen
2. In the Sensor Selection screen, press Up or Down to
select the Sensor (Sn-1, Sn-2, or Sn-3) that the output
references. The sensor you select here determines
the output control type (standard or reset control),
and output’s setup parameters and value ranges.
Press Next to save your sensor selection and go
to the next screen. If a sensor is not selected, the
remaining output setup screens do not appear. If a
sensor is already selected for the output, the Sensor
Selection screen does not appear here and the next
screen in the setup sequence appears instead.
Note: To set up a Standard Relay Output, you
must select Sn-1, Sn-2, or Sn-3 in this screen,
and the selected sensor must already be set
up in the System 450 UI. See Setting up System
450 Sensors for information and procedures on
setting up sensors.
The following figure shows the initial Relay
Output 4 Sensor Selection screen with no
sensor selected, followed by the same screen
with the (Master) Sensor 1 selected for Relay
Output 4.
Figure 26: Sensor Selection screens
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide12

3. In the Relay ON Selection screen, press Up or
Down to select the value at which the output relay
turns On. Relay ON is defined as relay LED On,
relay contacts LNO to LC are closed, and LNC to LC
contacts are open. Press Next to save your selection
and go to next screen.
Note: The value ranges and minimum
differential are determined by the selected
Sensor Type for the sensor that the output
references and are enforced in the Relay ON
and Relay OFF Selection screens.
The following figure shows an ON value of 55
(°F ) selected for Relay Output 4.
Figure 27: Relay ON Selection screen
4. In the Relay OFF Selection screen, press Up or
Down to select the value at which output relay turns
Off. Relay OFF is defined as relay LED Off, relay
contacts NC to C are closed, and NO to C contacts are
open. Press Next to save your selection and go to
next screen.
Note: The value ranges and minimum
differential are determined by the selected
Sensor Type for the sensor that the output
references and are enforced in the Relay ON
and Relay OFF Selection screens.
The following figure shows an OFF value of 65
(°F) selected for Relay Output 4.
Figure 28: Relay OFF Selection screen
5. In the Minimum Relay ON Time Selection screen,
press Up or Down to select the minimum time that
the output relay remains On after reaching the
Relay ON value. Minimum ON Time range is 0 to 300
seconds. Press Next to save your selection and go to
the next screen.
The following figure shows 0 seconds selected
for the minimum relay-on time for Relay Output
4.
Figure 29: Minimum Relay ON Time Selection screen
6. In the Minimum Relay OFF Time Selection screen,
press Up or Down to select the minimum time that
the output relay remains off after reaching the OFFT
value. Minimum Relay OFF Time range is 0 to 300
seconds. Press Next to save your selection and go to
the next screen.
The following figure shows 10 seconds selected
for the minimum relay-off time for Relay Output
4.
Figure 30: Minimum Relay OFF Time Selection screen
7. In the Unoccupied Setback Selection screen, press
Up or Down to select the Unoccupied Setback value.
The selected setback (SbK) value (temperature or
humidity) is added to the ON value (ON + SbK) and
OFF value (OFF + SbK) to calculate the setback ON
and OFF values that the output references during
the unoccupied times set up in the Occupied/
Unoccupied Schedule Setup screens. Press Next to
save your selection and go to the next screen.
Note: To use the Setback feature in your
control system, you must also set up the (real)
time and day of week, and a weekly occupied/
unoccupied schedule. See Setting up time
and day of week and Setting up an occupied/
unoccupied schedule for more information and
setup procedures.
The following figure shows 0 (°F) selected for
the Unoccupied Setback value for Relay Output
4.
Figure 31: Unoccupied Setback Selection screen
8. In the Sensor Failure Mode Selection screen,
press Up or Down to select the output's mode of
operation if the refererenced sensor or sensor wiring
fails. Press Next to save your selection and go to the
next screen.
The output operates in the selected mode until
the failure is remedied. Sensor Failure mode
selections for Relay Outputs include:
-ON—output relay remains on during sensor
failure.
-OFF—output relay remains off during sensor
failure.
The following figure shows sensor failure mode
ON selected for Relay Output 1; the output relay
is on if the referenced sensor or sensor wiring
fails.
Figure 32: Sensor Failure Mode Selection screen
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide 13

9. If you do not need to change the output’s sensor,
press Next in the Edit Sensor screen to save the
current sensor selection, complete the output setup,
and return to the Output Setup Start screen.
To change the output’s sensor, press Up or
Down in the Edit Sensor screen to select the
sensor that the output references. After you
select a different sensor, press Next to go to
the required output selection screen and repeat
the output setup procedure for the new Sensor
Type values.
Note: If you change the sensor that an output
references, the default setup parameters and
values for the output change, and you must set
up the output again.
Figure 33: Edit Sensor screen
10. The Standard Relay Output is now set up in the UI.
Press M to scroll through the remaining Setup Start
screens and continue setting up your control system,
or press Up and Down simultaneously to return to
the System 450 Main screens.
Figure 34: Relay Output Setup Start screen
Setting up a Relay Output with Reset
Setpoint
A relay output with reset setpoint provides On/Off control
to your application based on the Reset Setpoint sensor
(rES) that you set up for your control system.
1. In the Relay Output Setup Start screen, press
Next to go to the Sensor Selection screen. The
output number and output type (relay or analog)
are automatically assigned when you connect power
to the module assembly. See the Relay Output
with Reset Setpoint Setup Screens row in the setup
screens flow chart in System 450 menu flow example.
Note: All Setup Start screens are view-only;
selections cannot be made in Setup Start
screens.
The following figure shows the Relay Output
Setup Start screen for Output 2. The remaining
figures in this procedure show screens with the
parameter values selected for Relay Output 2
to control the temperature of Boiler 1 in Figure
3 based on the RSP set up in Setting up the
System 450 Reset Setpoint.
Figure 35: Relay Output Setup Start screen
2. In the Sensor Selection screen, press Up or Down to
select the Reset Setpoint Sensor (rES) for the output
to reference. The sensor selected here determines
the output control type (standard or reset control),
and the output’s setup parameters and value ranges.
Press Next to save your sensor selection and go to
next screen. If a sensor is not selected, the remaining
output setup screens do not appear. If a sensor is
already selected for the output, the Sensor Selection
screen does not appear here, the next screen in the
setup sequence appears instead.
Note: To set up a Relay Output with Reset
Setpoint, you must select rES in this screen. rES
cannot be selected until the Reset Setpoint is
set up in the System 450 UI. See Setting up the
System 450 Reset Setpoint for information and
procedures on setting up the RSP and rES.
The following figure shows the initial Relay
Output 2 Sensor Selection screen with no
sensor selected, followed by the same screen
with the Reset Setpoint sensor (rES) selected for
Relay Output 2.
Figure 36: Relay Output 2 Sensor Selection screens
3. In the Reset Differential Selection screen, press
Up or Down to select the Reset Differential value for
the output. Select a dIFF value to establish the fixed
differential between the floating Relay-OFF setpoint
(RSP) and the floating Relay-ON setpoint (RSP+dIFF).
See Table 3 for the (fixed) minimum differential and
the range of usable dIFF values for outputs with RSP
in your control system.
- A positive differential (dIFF = +n) turns the
relay ON when temperature or humidity
increases; typically cooling.
- A negative differential (dIFF = -n) turns the
relay ON when temperature or humidity
decreases; typically heating.
Press Next to save your selection and go to the
next screen.
The following figure shows -5 differential
selected for Output 2.
Figure 37: Reset Differential Selection screen
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide14

4. In the Offset from Reset Setpoint Selection screen,
press Up or Down to select the Reset Setpoint Offset
value for the output. Select an OSET value to shift
the (floating) Reset Setpoint (RSP) that the output
references to a (floating) offset reset setpoint (RSP
+OSET).
- A positive offset value (OSET = +n) raises
the target reset setpoint referenced by the
output.
- A negative offset value (OSET = -n) lowers
the target reset setpoint referenced by the
output.
OSET is typically used to set up sequential off-
set reset setpoint values and stage multiple
Relay Outputs. For example, four boilers can
be staged with 0, 2, 4, and 6 (°F) OSET values
to stage the four boilers ON according to load
increases. (You can also enable bAL to load bal-
ance the boiler runtimes. See Setting up the
System 450 Reset Setpoint for information on
the Load Balancing feature.) See Table 3 for the
range of usable OSET values for the outputs
with RSP in your control system.
Press Next to save your value and go to the
next screen.
The following figure shows 0 (°F) offset selected
for Output 2.
Figure 38: Offset from Reset Setpoint Selection screen
5. In the Minimum Relay ON Time Selection screen,
press Up or Down to select the minimum time that
the output relay remains On after reaching the
Relay ON value. Minimum ON Time range is 0 to 300
seconds. Press Next to save your selection and go to
the next screen.
The following figure shows 5 seconds selected
for the minimum ON-Time for Output 2.
Figure 39: Minimum Relay ON Time Selection screen
6. In the Minimum Relay OFF Time Selection screen,
press Up or Down to select the minimum time that
the output relay remains Off after reaching the Relay
OFF value. Minimum OFF Time range is 0 to 300
seconds. Press Next to save your selection and go to
the next screen.
The following figure shows 0 seconds selected
for the minimum OFF-Time for Output 2.
Figure 40: Minimum Relay OFF Time Selection screen
7. In the Sensor Failure Mode Selection screen, press
Up or Down to select the output’s mode of operation
if the referenced sensor or sensor wiring fails. The
output operates in the selected mode until the
failure is remedied.Sensor Failure mode selections
for Relay Outputs include:
-ON—output relay remains On during sensor
failure.
-OFF—output relay remains Off during sensor
failure.
Press Next to save your selection and go to the
next screen.
The following figure shows OFF sensor failure
mode selected for Output 2.
Figure 41: Sensor Failure Mode Selection screen
8. To change the output’s sensor, press Up or Down in
the Edit Sensor screen to select the sensor that the
output references. After you select a different sensor,
press Next to go to the required output selection
screen and repeat the output setup procedure for
the new Sensor Type values.
If you do not need to change the output’s sen-
sor, press Next in the Edit Sensor screen to
save the current sensor selection, complete the
output setup, and return to the Output Setup
Start screen.
Note: If you change the sensor that an output
references, the default setup parameters and
values for the output change, and you must set
up the output again.
Figure 42: Edit Sensor screen
9. The Relay Output with Reset Setpoint is now set up
in the UI. In the Relay Output Setup Start screen,
press M to scroll through the remaining Setup Start
screens and continue setting up your control system,
or press Up and Down simultaneously to return to
the System 450 Main screens.
Figure 43: Relay Output Setup Start screen
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide 15

Setting up a standard Analog Output
A standard analog output provides an analog signal to control your application based on a fixed setpoint sensor (Sn-1,
Sn-2, or Sn-3).
Analog outputs provide an auto-selecting analog signal that is proportional to the sensed input condition. The System
450 analog output senses the impedance of the controlled equipment’s analog input circuit and automatically delivers
either a 0–10 VDC or 4–20 mA signal to the controlled equipment.
The control action between the input signal and the output signal can be set up four different ways, depending on the
values selected for the Setpoint (SP), End Point (EP), Percent Output Signal Strength at Setpoint (OSP), and Percent
Output Signal Strength at End Point (OEP). The LCD displays different Control Ramp icons for the four control actions.
The following figure shows an example of the analog output setup values and the resulting output signal in a typical
space heating application (SP > EP and OSP < OEP). The following table shows the four Control Ramp icons and describes
their corresponding control actions and the setup value relationships required to configure the four control actions.
Figure 44: Control Ramp example for a typical heating application (SP > EP and OSP < OEP)
Table 5: System 450 Control Ramps, Analog Output control actions, and system setup value relationships
Control ramp
displayed
Control action Set the Analog Output value relationships for the desired
control action and corresponding control ramp
SP < EP
OSP < OEP
SP > EP
OSP < OEP
SP > EP
OSP > OEP
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide16

Table 5: System 450 Control Ramps, Analog Output control actions, and system setup value relationships
Control ramp
displayed
Control action Set the Analog Output value relationships for the desired
control action and corresponding control ramp
SP < EP
OSP > OEP
1. In the Analog Output Setup Start screen, press
Next to go to the Sensor Selection screen. The
output number and output type (relay or analog)
are automatically assigned when you connect power
to the module assembly. See the Standard Analog
Output Setup Screens row in the setup screens flow
chart in System 450 menu flow example.
Note: All Setup Start screens are view-only;
selections cannot be made in Setup Start
screens.
The following figure shows the Analog Output
Setup Start screen for Output 3. The remaining
screens in this procedure show the parameter
values selected for Analog Output 3 to control
an outside air damper in Figure 3.
Figure 45: Analog Output Setup Start screen
2. In the Sensor Selection screen, press Up or Down to
select the Sensor (Sn-1, Sn-2, or Sn-3) that the output
references. The sensor you select here determines
the output control type (standard or reset control),
and output’s setup parameters and value ranges.
Press Next to save your sensor selection and go
to the next screen. If a sensor is not selected, the
remaining output setup screens do not appear. If a
sensor is already selected for the output, the Sensor
Selection screen does not appear here and the next
screen in the setup sequence appears instead.
Note: To set up a Standard Analog Output, you
must select Sn-1, Sn-2. or Sn-3 in this screen,
and the selected sensor must already be set
up in the System 450 UI. See Setting up System
450 Sensors for information and procedures on
setting up sensors.
The following figure shows the initial Analog
Output 3 Sensor Selection screen with no
sensor selected, followed by the same screen
with the Sensor 3 (Sn-3) selected for Analog
Output 3.
Figure 46: Sensor Selection screens
3. In the Setpoint Selection screen, press Up or Down
to select the output’s Setpoint value. Select the
Setpoint value that the controlled system drives
towards and which, along with the End Point value,
defines the output’s proportional band. Press Next
to save your selection and go to the next screen.
Note: The output’s minimum proportional
band (between Setpoint and End Point) is
automatically enforced in the Setpoint and End
Point Selection screens.
The following figure shows a Setpoint of 50
(%rH) selected for Output 3.
Figure 47: Setpoint Selection screen
4. In the End Point Selection screen, press Up or
Down to select the output’s End Point value. Select
the End Point value that the controlled system drives
away from (towards Setpoint) and which, along with
the Setpoint value, defines the output’s proportional
band. Press Next to save your selection and go to
the next screen.
Note: The output’s minimum proportional
band (between Setpoint and End Point) is
automatically enforced in the Setpoint and End
Point Selection screens.
The following figure shows a End Point of 60
(%rH) selected for Output 3.
Figure 48: End Point Selection screen
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide 17

5. In the Output Signal Strength at Setpoint
Selection screen, press Up or Down to select the
output’s %Output Signal Strength at Setpoint value.
Select the strength of the signal that the output
generates when the sensed condition is at the
Setpoint value. Signal strength range is 0 to 100 (%).
Press Next to save your selection and go to the next
screen.
The following figure shows Analog Output 3
is set up to generate 10% of the total signal
strength when the input is at the Setpoint value
(= 1 V or 5.6 mA).
Figure 49: Output Signal Strength at Setpoint Selection
screen
6. In the Output Signal Strength at End Point
Selection screen, press Up or Down to select the
output’s %Output Signal Strength at End Point value.
Select the strength of the signal that the output
generates when the sensed condition is at the End
Point value. Signal strength range is 0 to 100 (%).
Press Next to save your selection and go to the next
screen.
The following figure shows Output 3 is set up to
generate 90% of the total signal strength when
the input is at the End Point value (= 9 V or 18.4
mA).
Figure 50: Output Signal Strength at End Point Selection
screen
7. In the Unoccupied Setback Selection screen, press
Up or Down to select the Unoccupied Setback value.
The selected setback (SbK) value (temperature
or humidity) is added to the SP value (SP+SbK)
and EP value (EP+SbK) to calculate a setback
proportional band that the output references during
the unoccupied times set up in the Occupied/
Unoccupied Schedule Setup screens. Press Next to
save the selected value and go to the next screen.
Note: To use the Setback feature in your
control system, you must also set up the (real)
time and day of week, and a weekly occupied/
unoccupied schedule. See Setting up time
and day of week and Setting up an occupied/
unoccupied schedule for more information and
setup procedures.
Note: Setback set point temperature does
not exceed MXSP or go lower than MNSP. In
reset, MNSP and MXSP are limits to set point
excursion.
The following figure shows 0 selected for the
Unoccupied Setback value for Output 3.
Figure 51: Unoccupied Setback Selection screen
8. In the Integration Constant Selection screen, press
Up or Down to select the Integration Constant for
the output. An integration constant allows you to set
up Proportional plus Integral (P+I) control for this
analog output. When properly set up, P+I control can
drive the load closer to Setpoint than proportional-
only control. Press Next to save your selection and
go to the next screen.
Initially, you should select the I-C value of 0
(zero) for no integration constant. Refer to the
System 450 Series Modular Controls Technical Bul-
letin (LIT-12011459) for more information on pro-
portional plus integral control and setting an
integration constant in the System 450 UI.
The following figure shows an Integration Con-
stant of 0 (zero) selected for Output 3.
Figure 52: Integration Constant Selection screen
9. In the Sensor Failure Mode Selection screen, press
Up or Down to select the Sensor Failure Mode for
the output. You can select the output’s mode of
operation in the event of a sensor or sensor wiring
failure. The output operates in the selected mode
until the failure is fixed. Press Next to save your
selection and go to the next screen.
Sensor Failure Mode selections for Analog Out-
puts include:
-ON—output goes to the OEP value.
-OFF—output goes to the OSP value.
The following figure shows the OFF Sensor Fail-
ure Mode selected for Output 3.
Figure 53: Sensor Failure Mode Selection screen
10. If you do not need to change the output’s sensor,
press Next in the Edit Sensor screen to save the
current sensor selection, complete the output setup,
and return to the Output Setup Start screen.
To change the output’s sensor, press Up or
Down in the Edit Sensor screen to select the
sensor that the output references. After you
select a different sensor, press Next to go to
the required output selection screen and repeat
the output setup procedure for the new Sensor
Type values.
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide18

Note: If you change the sensor that an output
references, the default setup parameters and
values for the output change, and you must set
up the output again.
Figure 54: Edit Sensor screen
11. The standard Analog Output is now set up in the UI.
Press M to scroll through the remaining Setup Start
screens and continue setting up your control system,
or press Up and Down simultaneously to return to
the System 450 Main screens.
Figure 55: Analog Output Setup Start screen
Setting up an Analog Output with Reset
Setpoint
An Analog Output with Reset Setpoint provides analog
signal control for your application based on the Reset
Setpoint sensor (rES) that you set up for your system.
See Setting up a standard Analog Output for general
information on setting up a System 450 Analog Output.
1. In the Analog Output Setup Start screen, press
Next to go to the Sensor Selection screen. The
output number and output type (relay or analog)
are automatically assigned when you connect power
to the module assembly. See the Analog Output
with Reset Setpoint Setup Screens row in the setup
screens flow chart in System 450 menu flow example.
Note: All Setup Start screens are view-only;
selections cannot be made in Setup Start
screens.
The following figure shows the Analog Output
Setup Start screen for Output 4. The remaining
screens in this procedure show the parameter
values selected for Analog Output 4 to control
Boiler 2 in Figure 3 based on the RSP set up in
Setting up the System 450 Reset Setpoint.
Figure 56: Analog Output Setup Start screen
2. In the Sensor Selection screen, press Up or Down to
select the Reset Setpoint Sensor (rES) for the output
to reference. The sensor selected here determines
the output control type (standard or reset control),
and the output setup parameters and value ranges.
Press Next to save your sensor selection and go
to the next screen. If a sensor is not selected, the
remaining output setup screens do not appear. If a
sensor is already selected for the output, the Sensor
Selection screen does not appear here, the next
screen in the setup sequence appears instead.
Note: To set up an Analog Output with Reset
Setpoint, you must select rES in this screen. rES
cannot be selected until the Reset Setpoint is
set up in the System 450 UI. See Setting up the
System 450 Reset Setpoint for information and
procedures on setting up the RSP and rES.
The following figure shows the initial Analog
Output 4 Sensor Selection screen with no
sensor selected, followed by the same screen
with the Reset Setpoint sensor (rES) selected for
Analog Output 4.
Figure 57: Sensor Selection screens
3. In the Proportional Band Selection screen, press
Up or Down to select this output’s Proportional
Band value. The Pb value establishes the fixed
proportional band between the (floating) setpoint
and end point. The (floating) proportional band’s
setpoint is RSP and the (floating) proportional
band’s end point is RSP+Pb. Press Next to save your
selection and go to the next screen. See Table 3 for
the (fixed) minimum proportional band and the
range of usable Pb values for outputs with RSP in
your control system.
The following figure shows a (floating) Propor-
tional Band of +5 (F) selected for Output 4.
Figure 58: Proportional Band Selection screen
4. In the Offset from Reset Setpoint Point Selection
screen, press Up or Down to select the Reset
Setpoint Offset value for the output. OSET is typically
used to set up sequential offset reset setpoint values
and stage multiple Analog Outputs. Select an OSET
value to shift the setpoint (RSP) (that the output
references) to an offset reset setpoint (RSP+OSET).
The OSET value also shifts the end point (RSP+Pb)
to an offset end point (RSP+OSET+Pb), shifting the
entire proportional band by the OSET value. See
Table 3 for the range of usable OSET values for the
outputs with RSP in your control system.
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide 19

- A positive offset value (OSET = +n) raises the
proportional band’s setpoint and end point
values.
- A negative offset value (OSET = -n) lowers the
proportional band’s setpoint and end point
values.
Press Next to save your selection and go to the
next screen.
The following figure shows an Offset value of 0
(zero) selected for Output 4.
Figure 59: Offset from Reset Setpoint Point Selection
screen
5. In the Output Signal Strength at Setpoint
Selection screen, press Up or Down to select the
%Output strength at Reset Setpoint value. Select
the signal strength that the output generates when
the sensed condition is at setpoint (RSP). The signal
strength range is 0 to 100 (%). Press Next to save
your selection and go to the next screen.
The following figure shows Analog Output
4 is set up to generate 0% of the total signal
strength when the input is at the Setpoint value
(= 0 VDC or 4 mA).
Figure 60: Output Signal Strength at Setpoint Selection
screen
6. In the Output Signal Strength at End Point
Selection screen, press Up or Down to select the
%Output strength at Reset End Point value. Select
the signal strength that the output generates when
the sensed condition is at end point (RSP+Pb). The
signal strength range is 0 to 100 (%). Press Next to
save your selection and go to the next screen.
The following figure shows Output 4 is set up
to generate 100% of the total output signal
strength when the input is at the End Point
value (= 10 VDC or 20 mA).
Figure 61: Output Signal Strength at End Point Selection
screen
7. In the Integration Constant Selection screen, press
Up or Down to select the Integration Constant for
the output. An integration constant allows you to set
up Proportional plus Integral (P+I) control for this
analog output. When properly set up, P+I control can
drive the load closer to Setpoint than proportional-
only control. Press Next to save your selection and
go to the next screen.
Initially, you should select the I-C value of 0
(zero) for no integration constant. Refer to the
System 450 Series Modular Controls Technical Bul-
letin (LIT-12011459) for more information on pro-
portional plus integral control and setting an
integration constant in the System 450 UI.
The following figure shows an Integration Con-
stant of 0 selected for Output 4.
Figure 62: Integration Constant Selection screen
8. In the Sensor Failure Mode Selection screen, press
Up or Down to select the Sensor Failure Mode
for the output. You can select the output’s mode
of operation in the event of a sensor or sensor
wiring failure. The output operates in the selected
mode until the failure is fixed. Sensor Failure Mode
selections for Analog Outputs include:
-ON—output goes to the OEP value.
-OFF—output goes to the OSP value.
Press Next to save your selection and go to the
next screen.
The following figure shows the OFF Sensor Fail-
ure Mode selected for Output 4.
Figure 63: Sensor Failure Mode Selection screen
9. If you do not need to change the output’s sensor,
press Next in the Edit Sensor screen to save the
current sensor selection, complete the output setup,
and return to the Output Setup Start screen.
To change the output’s sensor, press Up or
Down in the Edit Sensor screen to select the
sensor that the output references. After you
select a different sensor, press Next to go to
the required output selection screen and repeat
the output setup procedure for the new Sensor
Type values.
Note: If you change the sensor that an output
references, the default setup parameters and
values for the output change, and you must set
up the output again.
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide20